redstone help sticking piston

Can anyone help with a problem i am having? I put in several grinders and on the last one i am having problems with a piston sticking. When i activate it every thing works fine except for one of my crusher pistons will not retract.

I'm guessing you have the gate pistons right above your suffocation pistons? try having the piston come from the perpendicular position (so if piston A is facing north have piston B face east) instead of having the pistons both come from the same direction or be directly across from each other.

I'm not sure how many times you've tried, but often a piston will get stuck, but work fine once you log off and then back on. Sometimes that's the only solution. Of course, it could be a problem with the wiring, in which case you might want to re-do that part of the redstone.